| Iskar Reservoir | |
|---|---|
 | |
  Iskar Reservoir | |
| Coordinates | 42°28′14″N 23°34′24″E / 42.47056°N 23.57333°E |
| Type | reservoir |
| Primary inflows | Iskar River |
| Primary outflows | Iskar River |
| Catchment area | 1,046 km2 (404 sq mi) |
| Basin countries | Bulgaria |
| Max. length | 10.9 km (6.8 mi) |
| Max. width | 3.38 km (2.10 mi) |
| Surface area | 30 km (19 mi) |
| Max. depth | 75 m (246 ft) |
| Water volume | 673 hm3 (546,000 acre⋅ft) |
| Surface elevation | 820 m (2,690 ft) |
The Iskar Reservoir (язовир „Искър“) is the largest reservoir in Bulgaria. Situated on the Iskar River, it provides two-third of the water for the capital Sofia, and also produces hydroelectricity.
The reservoir has a total volume of 673 million m3, of which 580 million are in use and the rest is reserve. The reservoir has a drainage basin of 1,046 km2 and is 25 km long. It is situated at 820 m above sea level, its dam being 204 m long and 76 m high.